If you lap top has a monitor output, you can use a monitor cable. If the monitor has an HDMI input and your laptop has an HDMI output, you can connect that way. I use a device called Toshiba Dynadock. It connects to your computer via a USB cable and has monitor and HDMI outputs, USB outputs, and a Ethernet jack. You plug all of your devices into it so that there is only one cable to plug or unplug into your laptop when you take it on the go.
Toshiba - dynadock V 3.0 Universal USB 3.0 Docking Station